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STUDY OF THE EFFECT OF THE WEATHER VARIATION ON THE OCEAN ENVIRONMENT

天气变化对海洋环境影响的研究

基本信息

批准号：
13650974
负责人：
BABA Nobuhiro
金额：
$ 2.3万
依托单位：
OSAKA PREFECTURE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650974/
关键词：
OCEAN MIXING WEATHER PYCNOCLINE VERTICAL CIRCULATION SURFACE COOLING NAVIER-STOKES EQUATION CLOSED SEA WIND STRESS ロールキャビティ流

项目摘要

We investigate the mixing process in the surface layer of the ocean caused by the weather change by the experiment and the computation to elucidate its effect on the water quality in the closed sea.First, we choose the two-dimensional cavity flow to reproduce the mixing process when the uniform wind continues to blow over the stably stratified fluid in the ocean surface. The results show that a primary circulation forms in the top downstream corner, growing gradually, but bounded by a stratified fluid beneath as it were a wall. It is found that the density interface formed by erosion of the basic density gradient is distorted by the primary circulation. This is one of the important mechanisms for the mixing of the fluid in the lower layer beneath.Next, we simulate the mixing process in the upper ocean by cooling the surface by the atmosphere by the computation and experiment, and we examine the effects of the temperature variation on the process. The results show that the vertical profile of the horizontally averaged density distinguishes the mixed layer developing from the lower layer of stratification. When the cooling starts, the three-dimensional and regular cell structure is formed in the thin layer adjacent to the cooling top surface. The cool and dense fluid converges into the cell wall and falls down along it. It is found that the flow pattern of the three-dimensional vertical convection is dependent on the Reynolds number and it may affect the rate of mixing by surface cooling.We have established the comer stone of the study on this theme because our understanding of the dominant feature of this process of the mixing in the upper ocean is good enough to predict the effects on the process of the weather conditions such as radiation, temperature, and wind stress although they are limited to the simple conditions.

本文通过实验和数值计算研究了天气变化引起的海洋表层混合过程，以阐明天气变化对封闭海域水质的影响。首先，我们采用二维空腔流来模拟均匀风持续吹袭海洋表层稳定分层流体时的混合过程。结果表明，在上下游拐角处形成了一个主环流，该主环流逐渐增长，但其下被一个分层流体所包围，就像一堵墙。研究发现，一次环流使基本密度梯度侵蚀形成的密度界面发生畸变。其次，我们通过计算和实验模拟了大气冷却表层的上层海洋混合过程，并考察了温度变化对上层海洋混合过程的影响。结果表明，水平平均密度的垂直廓线将混合层的发展与下层的层结区分开来。当冷却开始时，在邻近冷却顶表面的薄层中形成三维且规则的单元结构。冷密流体向细胞壁汇聚，福尔斯沿细胞壁沿着下落，发现细胞壁内三种流体的流动形态不同。三维垂直对流取决于雷诺数，它可能通过表面冷却影响混合速率。我们已经建立了关于这一主题的研究的基石，因为我们对海洋上层混合过程的主要特征有足够的了解，预测辐射、温度、风应力等气象条件对过程的影响，但仅限于简单条件。